Java compact1, compact2, compact3 java.io Class OutputStream（JDK8）

Constructor Detail

• OutputStream

  public OutputStream()

Method Detail

• write

  public abstract void write(int b)
                      throws IOException

  Writes the specified byte to this output stream. The general contract for write is that one byte is written to the output stream. The byte to be written is the eight low-order bits of the argument b. The 24 high-order bits of b are ignored.

  Subclasses of OutputStream must provide an implementation for this method.

  Parameters:

  b - the byte.

  Throws:

  IOException - if an I/O error occurs. In particular, an IOException may be thrown if the output stream has been closed.

• write

  public void write(byte[] b)
             throws IOException

  Writes b.length bytes from the specified byte array to this output stream. The general contract for write(b) is that it should have exactly the same effect as the call write(b, 0, b.length).

  Parameters:

  b - the data.

  Throws:

  IOException - if an I/O error occurs.

  See Also:

  write(byte[], int, int)

• write

  public void write(byte[] b,
                    int off,
                    int len)
             throws IOException

  Writes len bytes from the specified byte array starting at offset off to this output stream. The general contract for write(b, off, len) is that some of the bytes in the array b are written to the output stream in order; element b[off] is the first byte written and b[off+len-1] is the last byte written by this operation.

  The write method of OutputStream calls the write method of one argument on each of the bytes to be written out. Subclasses are encouraged to override this method and provide a more efficient implementation.

  If b is null, a NullPointerException is thrown.

  If off is negative, or len is negative, or off+len is greater than the length of the array b, then an IndexOutOfBoundsException is thrown.

  Parameters:

  b - the data.

  off - the start offset in the data.

  len - the number of bytes to write.

  Throws:

  IOException - if an I/O error occurs. In particular, an IOException is thrown if the output stream is closed.

• flush

  public void flush()
             throws IOException

  Flushes this output stream and forces any buffered output bytes to be written out. The general contract of flush is that calling it is an indication that, if any bytes previously written have been buffered by the implementation of the output stream, such bytes should immediately be written to their intended destination.

  If the intended destination of this stream is an abstraction provided by the underlying operating system, for example a file, then flushing the stream guarantees only that bytes previously written to the stream are passed to the operating system for writing; it does not guarantee that they are actually written to a physical device such as a disk drive.

  The flush method of OutputStream does nothing.

  Specified by:

  flush in interface Flushable

  Throws:

  IOException - if an I/O error occurs.

• close

  public void close()
             throws IOException

  Closes this output stream and releases any system resources associated with this stream. The general contract of close is that it closes the output stream. A closed stream cannot perform output operations and cannot be reopened.

  The close method of OutputStream does nothing.

  Specified by:

  close in interface Closeable

  Specified by:

  close in interface AutoCloseable

  Throws:

  IOException - if an I/O error occurs.